Improved bail wat-car spring



D'. G. DANIELS.

Car Spring.

Patented Jan..11, 1870.

Ndubbed gieten paar arpa.

Yn. e. n'ANInLs, or oIIIcAeo, ILLINOIS.

Letters Patent No. 98,672, dated .Tanna/ry 11, 1870.

To all 'lL-hom yit may concern:

Be it known that I, D. G. DANIELS, formerly of Cincinnati, Hamilton county, and State of Ohio, butY now of Chicago, Ain the county of Cook, and State ot' Illinois, have invented a new and useful Improvement on Springs and I do hereby declare that the following is a full, clear, and exact description thereof, reerence-Vbeing had to the accompanying drawings, making a part of this speciiieation, in which- Figure l is aview showing a number of springs piled together, which are adapted for receiving supplemental springs between them.

Figure 2 is a diametrical section through fig. 1, showing the supplemental springs interposed between each pair of the plates which compose a spring.

Figure 3 is an edge view of a single spring composed o'f two bent plates.

-Similar letters of reference indicate corresponding parts in the three gures.

This invention relates to an improvement which is designed to remove an objection attending the spring for which Letters Patent were granted to me, bearing date on the 26thday of May, A. D. 1868.

It has been found, by practical test, that the springs above referred to will'collapse or Hatten, so as to aiford solid instead of enel-astio support, when they are subjected to extraordinary pressure or" load, which is very objectionable, and especially so when the/springs are employed for `the trucks of freight-cars, where the strength of the springs cannot be conveniently gauged -or made to accommodate itself to the varying loads which they Iare required to sustain.

lo overcome this diliiculty, and adapt a spring, of the description hereinafter described, to aii'ord an elastic support under ordinary as well as extraordinary loads, the nature of my invention consists iu interposingda supplemental or auxiliary spring between each pair of primary springs composing a pile, said interposed spring being so made and arranged, with relation to the yielding capacity of the spring, that, the primary spring will operate alone under ordinary loads, and under extraordinary loads, the secondary spring will be brought into action, and assist in sustaining such loads of an elastic support, as will be hereinafter described.`

lo enable others skilled in the art to understand my invention, I will describe its construction and operation.

In figs. l and 2, I4 have represented my improved springs piled together, and confined by a bolt, C, between the head c and nutd of this bolt; and

In g. 3, I have shown one spring detached from its gang or pile. p

Each` spring iscomposed of two plates, A A,o` steel, which plates are exactly alike in shape and size, and are put together so that they bear or touch only at'their edges,.a ai. These two plates are stamped out of a sheet 'of steel or other suitable springy metal,

diameter. They are then bent over the surface of a cylinder. y

The plates thus produced are punched so as to leave holes through their centres, for receiving through them the centre-rod C, after which they are tempered in the spring, are formed and put together precisely as de-4 scribed in my Letters Patent above referred to.

Between each pair of plates A A, forming a primary spring, I inter-pose a secondary spring, B, which, if a rod, C, be used, is perforated centrally, and held in place in the centre of the space between the plates A A, by means ofthe rod C, which unites the springs in gangs or piles, as shown in g. 2.

I prefer to make the springs of India rubber, of a circular form, and considerably thiclt'e/r in the centre than at the edges. One or two pieces of rubbermay he used" between each pair oi' plates A, and in pracf tice ,the springs B will be made somewhat less in thickness than the thickness of the space between plates A', so that under ordinary loads, these secondary springs will not come into play.

When an extraordinary load, which would be liable to press the spring-plates flat, is brought to act upon these plates, they will be compressed until secondary springs are caused to act, which will prevent the springplates fromV being' injured, and also afford an elastic support to the load.A

I am aware that lit is not a new idea to employ rubber blocks or 'secondary springs upon vehicles, to operate, under very heavy loads, in conjunction with the ordinary ellipticy springs, and, therefore, I do not claim, broadly, the use of such springs in combination with primary springs of an elliptic form.

I am' also aware that it is not new to interpose seoe ondary springs of India rubber between open concevoconvex primary springs, arranged in a pile, and composed of radial spring arms. I do not, therefore, claim, broadly, such contrivance.

Having described my invention,

What I do claim as new, and desire to secure by Letters Patent, is-

.The perforated secondary spring B, placed between the two arched or curved primary springs, A A, which touch at theirouter edges, and are adapted to operate substantially as described.

' D. G. DANIELS.

Witnesses: I

WM. 4Euer FUnNIss, J. M. VARNUM. 

